为确定覆岩隔离注浆充填工程中地面输浆管路堵塞机理,对输浆管路运行工况进行了监测,基于实测数据将输浆管路堵塞划分为附着型堵塞、沉积型堵塞和综合型堵塞3种类型。通过对粉煤灰浆体的流变特性、粉煤灰水化反应进行理论分析与实验验证,揭示了3种堵塞类型的形成机理,分析了管路粗糙度、化学成分、流速等因素对各类堵塞形成的影响。结果表明:附着型堵塞主要受粉煤灰水化反应胶凝化合物形成速率和浆体流速的双重影响;沉积型堵塞则主要是浆体流速过低导致的。据此提出了防止管路堵塞的建议措施。

To study the blockage mechanism of ground transport pipeline for isolated overburden grout injection,the operation condition of the slurry pipeline was monitored. Based on the measured data,the blockage of the slurry pipe-line was divided into three types:adherent type,sedimentary type and comprehensive type. The formation mechanism of three types of blockage was revealed by the theoretical analysis and experimental verification of the rheological proper-ties of pulverized coal ash and the hydration reaction of fly ash. The influence of pipeline roughness,chemical composi-tion and flow rate on all kinds of blockage was analyzed. The results show that the adherent type was mainly influenced by the formation rate of fly ash hydration reaction gelation compound and velocity of the slurry. The sedimentary type is mainly caused by the low velocity of the slurry. In view of the above,some suggestions for preventing pipeline blockage were proposed by the authors.